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3rd Internal Meeting

2009 April 17

Present: Mark, Des, Dominik

  1. The main objective of the meeting
    • internal discussion on communication protocols and behaviour of software modules
    • updates and changes in software modules
  2. Data in communication protocol
    • the integer identifier for radio telescope, TN and correlator will NOT be a part of a protocol
    • each resource will be distinguished by service URL
    • the integer experimentId field will be changed to String jobId. This jobId value has to be added to the communication protocol.
    • the jobId value is used differentiate data in case where the same experiment data is being correlated at the same time, but with different parameters
  3. Translation Node related issues
    • there was a discussion on how to distinguish chunks from different TNs
      • each chunk has its own identifier (long)
      • we agreed that if chunks from different TN have the same identifiers we can treat them as corresponding chunks and correlate them
        • it is TN job to make sure that chunks receive proper identifiers
  4. Confirmation messages
    • the communication pattern between Broker and TN will be changed as follows:
      • all messages are asynchronous
      • Broker sends startTranslationJob message to TN
      • TN decodes the message and sends back information to VLBI Broker with the status OK or ERROR
        • that operation should be added to the protocol [Dominik]
      • then TN sends notifications that new data chunks are ready
    • chunkCount should be added to ChunkInfo so Broker knows how many chunks will be sent by TN
      • Des needs to update the code to include that information
      • chunks are numbered starting form zero so N-1 of N is a termination condition
  5. Monitoring - FUTURE WORK
    • WFM presents list of active observation workflows
    • possibility to monitor workflow
    • possibility to stop workflow execution
    • we agreed to implement that in EXPReS 2
  6. Action items
    • make all the changes and generate new WSDL file by April 24th [Dominik] [DONE]
      • all the changes has been incorporated
      • new WSDL files have been generated for all services, see page Communication Protocol
    • update all services and deploy them on Huygens by April 24th [Dominik]
    • update TN service by April ?? [Des]
expres/3-internal-minutes-2009-04-17.txt · Last modified: 2009/04/24 16:06 by